{"product_id":"centum-vp-field-control-units-yokogawa-afs20d","title":"CENTUM VP Field Control Units | Yokogawa AFS20D","description":"\u003ch2\u003eYOKOGAWA AFS20D Duplex Field Control Unit\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eYOKOGAWA AFS20D\u003c\/strong\u003e, also cataloged as the \u003cstrong\u003eAFS20D\u003c\/strong\u003e CPU Processor, operates as a dedicated hardware component for control logic execution, real-time data processing, and backplane bus routing within CENTUM VP distributed control networks. Powered by a VR5432 RISC processor clocked at 133 MHz, the unit orchestrates continuous loop control, logic sequences, and math operations across attached network nodes. The system executes high-speed task scheduling over dual V-net\/IP links to synchronize human-interface stations and remote I\/O drivers.\u003c\/p\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eAFS20D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eYokogawa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eJapan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e8 kg (Cabinet unit) \/ 0.3 kg (Processor engine card)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e207 x 265.9 x 482.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e0 to +55 deg C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e80 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessor Engine\u003c\/td\u003e\n\u003ctd\u003eVR5432 RISC (133 MHz clock frequency)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Memory\u003c\/td\u003e\n\u003ctd\u003e16 MB with 72-hour battery retention backup\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Cycle Rate\u003c\/td\u003e\n\u003ctd\u003eMinimum 100 ms execution cycle (Typical 200 ms to 1 s)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSystem Capacity\u003c\/td\u003e\n\u003ctd\u003eUp to 8 Node Interface Units (NIU) \/ Max 256 I\/O points\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperational Redundancy\u003c\/td\u003e\n\u003ctd\u003eDual CPUs, dual 24 VDC power modules, dual V-net\/IP, dual ESB bus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSwitchover Failover Time\u003c\/td\u003e\n\u003ctd\u003eLess than or equal to 10 ms seamless CPU transfer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIngress \u0026amp; Safety Limits\u003c\/td\u003e\n\u003ctd\u003eSIL2 safety compliance, CE, UL, CSA certification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eProcess Control System Technical Characteristics\u003c\/h3\u003e\n\u003cp\u003eBuilt for the CENTUM VP and CS 3000 control infrastructure, the unit provides hardware redundancy across its core CPU, power supply paths, and communication interfaces. The dual-processor layout executes lockstep control routines to ensure that field control continues uninterrupted if a fault disables the active processor. The system utilizes channel-to-channel isolation parameters across its backplane connectors, suppressing high-voltage spikes and ground loop noise while routing real-time process data over the 4-20 mA HART loop protocol framework.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003eQ: How does the dual-CPU architecture achieve a switchover time of less than or equal to 10 ms during a processor hardware fault?\u003c\/p\u003e\n\u003cp\u003eA: The primary and standby VR5432 processors execute the control logic simultaneously in lockstep. Internal hardware cross-checking logic continuously validates memory states over the backplane bus. If a CPU hardware fault or parity error is flagged, the standby processor assumes the active execution role within 10 ms without losing system state data or disrupting output signals.\u003c\/p\u003e\n\u003cp\u003eQ: What happens to the 16 MB control program memory during a complete plant power outage?\u003c\/p\u003e\n\u003cp\u003eA: The module includes an internal battery backup circuit that preserves the main memory registers and system configuration parameters for up to 72 hours. When utility power is restored, the processor resumes execution from the exact pre-outage state without requiring a manual cold-start firmware reload.\u003c\/p\u003e\n\u003cp\u003eQ: Is online hot-swapping permitted for attached Node Interface Units (NIU) while the AFS20D is actively running process loops?\u003c\/p\u003e\n\u003cp\u003eA: Yes. The system architecture supports full hot-swappable I\/O replacement on active NIU nodes. Field technicians can remove and replace faulty interface boards without shutting down the primary CPU or disturbing adjacent control loops on the ESB bus network.\u003c\/p\u003e\n\u003ch3\u003eField Installation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCabinet Mechanical Seating:\u003c\/strong\u003e Mount the unit inside a standard 19-inch rack enclosure using M5 retention screws. Verify that the cabinet frame is mechanically bolted to prevent vibration-induced pin displacement on the backplane connections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRedundant Power Line Wiring:\u003c\/strong\u003e Connect independent 24 VDC primary and secondary power feeds to the dual power terminal blocks. Route each power line through separate circuit breakers to ensure power supply redundancy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShield Grounding Matrix:\u003c\/strong\u003e Connect the V-net\/IP and ESB bus cable shields directly to the cabinet instrument grounding bar. Keep the functional earth path separate from active power grounds, maintaining a total resistance below plant safety standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Ventilation Barriers:\u003c\/strong\u003e Maintain a minimum 100 mm vertical clearance above and below the FCU chassis to facilitate convective heat transfer. If ambient cabinet temperatures exceed 55 deg C, install fan-assisted cooling units to prevent thermal processor throttling.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Yokogawa","offers":[{"title":"Default Title","offer_id":43698743672922,"sku":"AFS20D","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0710\/5957\/0778\/files\/660..jpg?v=1784687695","url":"https:\/\/www.spareoil.com\/products\/centum-vp-field-control-units-yokogawa-afs20d","provider":"SpareOil Automation","version":"1.0","type":"link"}